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(#)The daily puzzle:
What does '*****' mean in the following text?
"A ***** is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. A ***** is a turbomachine with at least one moving part called a rotor assembly, which is a shaft or drum with blades attached. Moving fluid acts on the blades so that they move and impart rotational energy to the rotor. Early ***** examples are windmills and waterwheels."
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